Electric power supply device for slide structure

ABSTRACT

The electric power supply device for a slide structure includes: a casing which receives a wiring harness folded in a U-shape; a slider which holds a movable end of the wiring harness and slidably engages with the casing; and a harness supporting member which slidably contactually engages with a folded part of the wiring harness and includes a supporting plate body for supporting an inner side face of the wiring harness. The device prevents the wiring harness from hanging down or bending when the slide structure is moved, so that a smooth and secure slide operation is attained.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to an electric power supply device for aslide structure, which securely prevents a long wiring harness arrangedin a casing by being folded in a U-shape from being bent, coping with along-sliding-type slide structure such as a slide door and slide seat ofa motor vehicle.

(2) Description of the Related Art

FIG. 1 shows an example of a conventional electric power supply deviceas disclosed in Japanese Patent Application Laid-Open No. H11-342807.

An electric power supply device 61 is mounted on a slide door of a motorvehicle and includes a long casing 63 for receiving a flat wiringharness 62 by folding it in a U-shape, a flexible reinforcing plate 64provided on an outer surface of the flat wiring harness 62, a slider 65provided on a movable end of the flat wiring harness 62, and a rail 66for slidably engaging with the slider 65.

The reinforcing plate 64 is made of a thin steel material and sticks toa magnetized wall 67 of the casing 63 so as to prevent the flat wiringharness 62 from hanging down. The movable end of the flat wiring harness62 is connected to a wiring harness 68 at the slider 65, while a fixedend of the flat wiring harness 62 is connected to a wiring harness 69 onthe side of the slide door.

When the slide door is opened or closed, the slider 65 moves back andforth along the rail 66, while the flat wiring harness 62 moves back andforth integrally with the slider 65 as being bent in a U-shape so as toabsorb a stroke of opening and closing slide door. Thereby, electricpower or electric signal is always supplied from the body-side of thevehicle to auxiliary machines of the slide door.

However, as for the conventional electric power supply device 61 asdescribed above, since the flat wiring harness 62 is used as a wiringharness, the number of circuits or supplying current is limited.Further, since the reinforced plate 64 made of steel material is usedand the wall 67 of the casing 63 is magnetized to make the reinforcedplate 64 adhered to the wall 67 magnetically, causing a complicatedstructure and increase in cost.

Therefore, instead of the flat wiring harness 62, an electric powersupply device (not shown) has been proposed, in which device a normalwiring harness having a cross section of a round shape or rectangularshape is used for preventing the wiring harness from hanging down due toits stiffness.

However, as for the electric power supply device described above, if theslide stroke is short, it works well, but on the other hand, if theslide stroke is long as seen in a case of an electric power supplydevice 71 for a long slide door or long slide seat of a motor vehicle asshown in FIGS. 16-18, when the slide structure such as the slide door orslide seat moves, as shown in FIG. 17, the wiring harness 72 hangs downor bends during the movement, and when the wiring harness 72 is beingslid further, as shown in FIG. 18, the wiring harness 72 is foldedrepeatedly, causing that the wiring harness 72 can not be slid further.Here, in FIG. 16, the reference numeral 73 denotes the slider and 74denotes the casing.

SUMMARY OF THE INVENTION

It is therefore an objective of the present invention to solve the aboveproblem and to provide an electric power supply device for a slidestructure, which prevents the wiring harness from hanging down orbending when the slide structure such as the long slide door or longslide seat is moved, thereby enabling a smooth and secure slideoperation.

In order to attain the above objective, the present invention is toprovide an electric power supply device for a slide structure including:

a casing which receives a wiring harness folded in a U-shape;

a slider which holds a movable end of the wiring harness and slidablyengages with the casing; and

a harness supporting member which slidably contactually engages with afolded part of the wiring harness and includes a supporting plate bodyfor supporting an inner side face of the wiring harness.

With the construction described above, the wiring harness is folded in aU-shape in the casing, a part of the harness supporting member slidablycontactually engages with the folded part of the wiring harness, thesupporting plate body of the harness supporting member comes in contactwith the inner side face of the wiring harness, the wiring harness movesintegrally with the slider, and the harness supporting member moves in amoving direction of the slider integrally with the wiring harness by adistance, which is half of a distance that the slider moves. The wiringharness is stably supported by the supporting plate body with surfacecontact, line contact or a plurality of point contacts when the slidemoves, thereby preventing the wiring harness from hanging down or beingbent, so that the slider can smoothly move without obstruction. Thewiring harness consists of a part that continues to the slider andanother part that continues to the folded part.

With the construction described above, since the supporting plate bodyof the harness supporting member comes in contact with the wiringharness for a long distance so as to prevent the wiring harness fromhanging down or being bent, therefore the wiring harness never bucklesin the casing when the slider moves for a long distance, therebyenabling a smooth long sliding action and improving reliability ofconstant. electric power supply to a long sliding-type slide structure.

Preferably, the supporting plate body slidably engages with the casing.

With the construction described above, the supporting plate body cansmoothly move back and forth along the casing with being positionedstably. The supporting plate body is prevented from being inclined andbeing shifted, allowing the supporting plate body to support the wiringharness securely.

Preferably, the device further includes a guiding part located in theproximity of a wall of a short side of the casing, wherein the guidingpart slidably engages with a slide engaging part of the harnesssupporting member.

With the construction described above, for example, when the casing isaffected by an external force which presses the casing in the thicknessdirection of the casing or when a wall of a long side of the casing isinwardly bent and deformed, since the guiding part and the slideengaging part are provided in the proximity of a wall of a short side ofthe casing (i.e. on a wall of a short side or in the proximity of a wallof a short side of the casing), therefore the guiding part or the slideengaging part is never affected by an external force or an influence ofbending, allowing the sliding action between the guiding part and theslide engaging part to be carried out smoothly with small friction.

Even when the casing is affected by an external force or deformation inits collapsing direction, the sliding action of the harness supportingmember can be carried out smoothly without obstruction.

Preferably, the harness supporting member includes a sliding part in theproximity of a wall of a short side of the casing, wherein the slidingpart slidably contacts with an inner wall face of the casing.

With the construction described above, for example, when the casing isaffected by an external force which presses the casing in the thicknessdirection of the casing or when a wall of a long side of the casing isinwardly bent and deformed, since the sliding part of the harnesssupporting member is placed in the proximity of the wall of the shortside of the casing, the sliding part is never affected by an externalforce or an influence of bending, allowing the sliding action betweenthe sliding part and the inner wall face of the casing to be carried outsmoothly with small friction.

Even when the casing is affected by an external force or deformation inits collapsing direction, the sliding action of the harness supportingmember can be carried out smoothly without obstruction.

Preferably, a part that slidably contactually engages with the foldedpart of the wiring harness consists of a pair of guiding plates.

With the construction described above, when the slider moves, the foldedpart of the wiring harness smoothly moves between the pair of theguiding plates and presses one of the guiding plates in a movingdirection of the slider, so that the harness supporting member is movedin the moving direction of the slider by a distance that is half of adistance that the slider moves.

With the construction described above, when the slider moves, theharness supporting member can be moved correctly and smoothly, allowingthe sliding action of the slider to be carried out smoothly.

Preferably, a part that slidably contactually engages with the foldedpart of the wiring harness consists of a pulley and at least one smallroller facing with the pulley.

With the construction described above, when the slider moves, the foldedpart of the wiring harness smoothly moves between the pulley and thesmall roller and pressing the pulley or the small roller in the movingdirection of the slider, so that the harness supporting member is movedin the moving direction of the slider by a distance that is half of adistance that the slider moves. Here, the number of the small roller(s)may be one or more.

With the construction described above, when the slider moves, thesliding friction between the slider and the folded part of the wiringharness is reduced, so that when the slider moves, the harnesssupporting member can be moved correctly and smoothly, allowing thesliding action of the slider to be carried out smoothly.

Preferably, a part that slidably contactually engages with the foldedpart of the wiring harness consists of a pulley and a guiding platefacing with the pulley.

With the construction described above, when the slider moves, the foldedpart of the wiring harness smoothly moves between the pulley and theguiding plate and pressing the pulley or the guiding plate in the movingdirection of the slider, so that the harness supporting member is movedin the moving direction of the slider by a distance that is half of adistance that the slider moves.

With the construction described above, when the slider moves, thesliding friction between the slider and the folded part of the wiringharness is reduced, so that when the slider moves, the harnesssupporting member can be moved correctly and smoothly, allowing thesliding action of the slider to be carried out smoothly.

Preferably, an extension resilient member is arranged between thesupporting plate body and the slider.

With the construction described above, when the slider moves, theextension resilient member is pulled and extended while the extensionresilient member resiliently biases the harness supporting member in themoving direction of the slider,.a part slidably contactually engaged ofthe harness supporting member presses the folded part of the wiringharness in the moving direction of the slider, so that the wiringharness is maintained in its fully extended condition between the sliderand the part slidably contactually engaged.

With the construction described above, since the extension resilientmember biases the harness supporting member in the moving direction ofthe slider so as to maintain the wiring harness in its fully extendedcondition, therefore the wiring harness is securely prevented fromhanging down or being bent.

Preferably, an outer periphery of the wiring harness is covered with anet tube that comes in point contact or line contact with the supportingplate body.

With the construction described above, when the slider moves, the nettube made of synthetic resin smoothly slidingly comes in contact withthe supporting plate body of the harness supporting member and theguiding plate with small frictional resistance due to a small contactsurface such as a point contact surface or line contact surface. Aplurality of electric wires may be directly covered with the net tube asa protective tube for the wiring harness, or alternatively, a corrugatedtube may be covered with the net tube.

With the construction described above, the net tube reduces thefrictional resistance with respect to the supporting plate body,allowing the wiring harness to extend or shrink smoothly.

Preferably, the casing includes a narrow part and a wide part, a partthat slidably contactually engages with the folded part of the wiringharness is located in the wide part, and the supporting plate body canenter into the narrow part.

With the construction described above, the supporting plate body entersinto the narrow part of the casing together with the wiring harness soas to stably support the wiring harness in the narrow part, therebysecurely preventing the wiring harness from being bent in the narrowpart. In the narrow part, the wiring harness can be supported withoutlarge bending on the inner wall face of the narrow part as well as onthe supporting plate body. The narrow and wide parts extend the wholelength of the casing, facilitating the long sliding action.

With the construction described above, since the narrow part, whichsupports the wiring harness together with the supporting plate body orwith the supporting plate body and the inner wall face of the casing, isprovided, so that the whole length of the casing is extended,facilitating the long sliding action.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electric power supply device for aslide structure according to the first preferred embodiment of thepresent invention when the slider is located at a forward end position;

FIG. 2 is a perspective view of the electric power supply device for aslide structure according to the first preferred embodiment when theslider is located at an intermediate position;

FIG. 3 is a perspective view of the electric power supply device for aslide structure according to the first preferred embodiment when theslider is located at a backward end position;

FIG. 4 is a perspective view of an electric power supply device for aslide structure according to the second preferred embodiment of thepresent invention when the slider is located at a forward end position;

FIG. 5 is a perspective view of the electric power supply device for aslide structure according to the second preferred embodiment when theslider is located at an intermediate position;

FIG. 6 is a perspective view of the electric power supply device for aslide structure according to the second preferred embodiment when theslider is located at a backward end position;

FIG. 7 is a perspective view of an electric power supply device for aslide structure according to the third preferred embodiment of thepresent invention when the slider is located at a forward end position;

FIG. 8 is a perspective view of the electric power supply device for aslide structure according to the third preferred embodiment when theslider is located at an intermediate position;

FIG. 9 is a perspective view of the electric power supply device for aslide structure according to the third preferred embodiment when theslider is located at a backward end position;

FIG. 10 is a cross sectional view taken along 10-10 line in FIG. 2illustrating a preferred embodiment of a slide structure of a harnesssupporting member and casing in the electric power supply device;

FIG. 11 is a longitudinal cross sectional view illustrating anotherpreferred embodiment of a slide structure of a harness supporting memberand casing;

FIG. 12 is a longitudinal cross sectional view illustrating a furtherpreferred embodiment of a slide structure of a harness supporting memberand casing;

FIG. 13 is a longitudinal cross sectional view illustrating an exampleof a contact form between a wiring harness and a harness supportingmember;

FIG. 14 is a longitudinal cross sectional view illustrating anotherexample of a contact form between a wiring harness and a harnesssupporting member;

FIG. 15 is a cross sectional view illustrating an example of aconventional electric power supply device;

FIG. 16 is a perspective view illustrating a conventional electric powersupply device for a slide structure;

FIG. 17 is a perspective view illustrating a process in a problem of aconventional electric power supply device for a slide structure; and

FIG. 18 is a perspective view illustrating a problem of a conventionalelectric power supply device for a slide structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the following, the preferred embodiments of the present inventionwill be explained with reference to the attached drawings.

FIGS. 1-3 illustrate the first preferred embodiment of an electric powersupply device for a slide structure according to the present invention.

An electric power supply device 1 for a slide structure includes: a longcasing; a wiring harness 3 having a round or elliptic shape in its crosssection to be received in the casing being bent in a U or J-shape; aslider 6 which holds an end (movable end) of the wiring harness 3 and isset slidable in the longitudinal direction of the casing along thecasing; and a harness supporting member 4 which slidably contactuallyengages with a bent part (folded part) 3 b of the wiring harness 3 andis set slidable along the casing with holding the wiring harness 3 withsurface contact or line contact.

The casing includes a casing body 2 and a cover (not shown in thefigure) both made of synthetic resin or metal, wherein the casing body 2includes a narrow part 2 a in a front half and a wide part 2 b thatcontinues to the narrow part 2 a through an intermediate step part 8. Thcover has a plate-shape, which covers an opening on the front side ofthe casing body 2. The casing body 2 and the cover are fixed to eachother with fixing means such as a locking projection and an engagingrecess or fastening means such as a bolt and a nut.

The casing body 2 includes a base wall 9 and respective walls 10-14 asperipheral walls rising up around the base wall 9. The base wall 9 has anarrow part of its front half and a wide part of its rear half. A longgroove or long hole is provided as a guiding part 17 for slidablyengaging both side ends of a supporting plate body 7 of the harnesssupporting member 4 therewith in a range from a middle position of thenarrow part to the rear end-side of the wide part of the base wall 9 andthe cover (not shown in the figure). The guiding part 17 is situatedstraight from the lower half of the narrow part 2 a to the upper part ofthe wide part 2 b.

As shown in FIG. 1, an upper wall 10 of the casing body 2 is providedwith a slit-shaped long hole as a guiding part 18 for slidably guidingthe slider 6, wherein a groove 19 of the slider 6 slidably engages withthe guiding part 18, the groove 19 being situated at a middle positionin the height direction of the slider 6, and an upper half of the slider6 is exposed to the outside of the casing body 2 while a lower half ofthe slider 6 is positioned in the narrow part 2 a of the casing body 2.A harness part 20 on the movable side of the wiring harness 3 is bent ina L-shape and guided through the slider 6 and a connector 21 forconnection use is formed at an end of the harness part 20.

The narrow part 2 a of the casing body 2 includes a lower wall 11 thatcontinues to the step part 8, a front end wall 13, a base wall and anupper wall 10. The wide part 2 b of the casing body 2 includes a lowerwall 12, an front end wall situated on the side of the step part 8, arear end wall 14 (see FIG. 2), a base wall 9 and the upper wall 10. Thebase wall 9 and the upper wall 10 extends with the respective sameplanes in the narrow part 2 a and the wide part 2 b.

As shown in FIG. 1, at the forward end position of the slider 6, thewiring harness 3 is arranged along an inner surface of the upper wall 10starting from the slider 6 over a range from a front end of the narrowpart 2 a to a front end of the wide part 2 b of the casing body 2,stably supported by the harness supporting member 4 without being bentwith surface contact or line contact, arranged along the lower wall 12being bent in a U-shape in the proximity of the front end of the widepart 2 b, and guided to the outside from an opening 22 of the wall 8 ofthe step.

As shown in FIG. 1, the harness supporting member 4 includes: thehorizontal supporting plate body 7 having a rectangular shape or a bandplate-shape; a connecting plate 33 continuing to the supporting platebody 7 vertically at a rear end of the supporting plate body 7; and apair of guiding plate 34, 35 each having an arc shape facing to eachother, which guiding plates are projectingly formed on an inner surfaceof a rear end part of the connecting plate 33.

A lower side surface (inner side surface) of an upper part (concavepart) 3 a of the wiring harness 3 is supported by an upper side surface(outer side surface) of the supporting plate body 7 with surface contactor line contact in the longitudinal direction. A bent part 3 b of thewiring harness 3 slidably contactually engages with between the pair ofthe guiding plates 34, 35 being put therebetween. The harness supportingmember 4 is movable integrally with the bent part 3 b of the wiringharness 3 in the same direction. The connecting plate 33 slidescontacting with an inner surface of the base wall 9 of the casing body 2so as to stabilize a posture of the harness supporting member 4.

The wiring harness 3 includes a known corrugated tube 26 (see FIG. 13)made of synthetic resin on an outer periphery thereof. The corrugatedtube 26 includes parallel and alternating ridges 26 a and grooves 26 bin the peripheral direction so as to have good flexibility. Thecorrugated tube 26 is provided in a range from the slider 6 to theopening 22 of the casing body 2. A plurality of insulating coatedelectric wires are received within the corrugated tube 26, therebyconstructing the wiring harness 3.

If the wiring harness 3 includes the corrugated tube 26 having a roundshape in section, the corrugated tube 26 is stably supported by thesupporting plate body 7 of the harness supporting member 4 with linecontact in the longitudinal direction. If the wiring harness 3 includesthe corrugated tube 26 having a elliptic shape in section, thecorrugated tube 26 is stably supported by the supporting plate body 7 ofthe harness supporting member 4 with surface contact. If the wiringharness 3 is constructed by winding up a plurality of electric wireswith a tape without having the corrugated tube 26, the wiring harness 3is stably supported by the supporting plate body 7 of the harnesssupporting member 4 with line contact or surface contact.

As shown in FIG. 1, at the forward end position of the slider 6, thesupporting plate body 7.of the harness supporting member 4 is positionedon a rear half of the upper side part 3 a of the wiring harness 3 so asto stably support the upper side part 3 a of the wiring harness 3without hanging down and bending of the wiring harness 3. A front halfof the upper side part 3 a of the wiring harness 3 is not directlysupported by the harness supporting member 4. However, the front half issupported between the slider 6 and a front end 7 a of the harnesssupporting member 4, thereby preventing the wiring harness 3 fromhanging down and bending.

Even if the upper side part 3 a of the wiring harness 3 hangs down orbends, since the wiring harness 3 is supported by the lower wall 11 ofthe narrow part 2 a of the casing body 2 without hanging down greatly,there is no problem. Accordingly, the length of the narrow part 2 a ofthe casing body 2 can be extended to a desired size, thereby enabling tomeet with any sliding length.

When the slide structure (not shown in the figure) such as the slidedoor or slide sheet is slid starting from the state shown in FIG. 1, asshown in FIG. 2, the slider 6 moves backward, the upper side part 3 a ofthe wiring harness 3 moves backward integrally with the slider 6 so asto be guided within the wide part 2 a of the casing body 2, and theharness supporting member 4 moves backward integrally with the wiringharness 3 so as to stably support the upper side part 3 a of the wiringharness 3 within the wide part 2 a with surface contact or line contact.The bent part (folded part) 3 b of the wiring harness 3 slides betweenthe pair of the guiding plates 34 and 35 of the harness supportingmember 4 while the guiding plates 34 and 35 move backward integrallywith the bent part 3 b and the supporting plate body 7 moves in the samedirection integrally with the guiding plates 34 and 35 with supportingthe wiring harness 3.

As shown in FIG. 2, when the slider 6 is positioned in the proximity ofthe step 8 of the casing body 2, the length of the upper side part 3 aof the wiring harness 3 becomes approximately the maximum giving acondition that the hanging down or bending of the wiring harness 3 ismost likely to occur. However, a front end 7 a of the supporting platebody 7 is positioned approximately on the step 8 and a rear end 7 b ofthe supporting plate body 7 is positioned in the proximity of the bentpart 3 b of the wiring harness 3 (this position always remainingunchanged in the sliding process), so that the supporting plate body 7stably supports the upper side part 3 a of the wiring harness 3 in thewide part 2 b of the casing body 2 over the full length of the upperside part 3 a of the wiring harness 3. Thereby, the wiring harness 3 issecurely prevented from hanging down or bending, so that the slidingmotion of the slider 6 is smoothly performed without any interference.

As shown in FIG. 3, when the slider 6 moves to a backward end positionstarting from the state shown in FIG. 2, the length of the upper sidepart 3 a of the wiring harness 3 is mostly shortened, causing nooccurrence of the hanging down of the wiring harness 3, and a lower sidepart 3 c of the wiring harness 3 is extended long along the lower wall12 of the casing body 2. Since the lower side part 3 c of the wiringharness 3 is a part situated on the side of a fixed portion, the lowerside part 3 c never bends. The supporting plate body 7 of the harnesssupporting member 4 is positioned in the wide part 2 b of the casingbody 2 protruding to the front of the slider 6 and the guiding plate 35is positioned in the proximity of the rear wall 14 of the casing body 2together with the bent part 3 b of the wiring harness 3.

When the slider 6 is moved in the reverse direction (i.e. forward)starting from the state shown in FIG. 3, the length of the upper sidepart 3 a of the wiring harness 3 is increased,.the harness supportingmember 4 supports the upper side part 3 a of the wiring harness 3 overthe full length of the upper side part 3 a at the middle position shownin FIG. 2 so as to prevent the upper side part 3 a from hanging down orbending, so that the slider 6 smoothly moves to the forward end withoutany interference as shown in FIG. 1.

The movable distance of the bent part 3 b of the wiring harness 3, thatis, the movable distance of the harness supporting member 4 is half ofthe movable distance of the slider 6. The position of the slider 6 orthat of the bent part 3 b of the wiring harness 3 varies according to alinear function. To the contrary, the central position of the upper sidepart 3 a of the wiring harness 3 within the wide part 2 b of the casingbody 2, that is, the position of the part that tends to hang down orbend most varies according to a quadratic function. Accordingly, theharness supporting member 4 supports the upper side part 3 a of thewiring harness 3 approximately over the full length of the upper sidepart 3 a within the wide part 2 b of the casing body 2, thereby securelypreventing the wiring harness 3 from hanging down or bending.

The hanging down of the upper side part 3 a of the wiring harness 3occurs when the electric power supply device 1 is placed longitudinallyas shown in FIGS. 1-3, while the bending of the upper side part 3 a ofthe wiring harness 3 occurs when the electric power supply device 1 isplaced laterally. That is, the bending is a concept that includes thehanging down in a broad sense.

The states shown in FIG. 1 and FIG. 3 are states in which the slidestructure (not shown in the figure) such as a slide door or slide seatis slid to the forward and backward end positions, respectively. Forexample, when the electric power supply device 1 is placedlongitudinally on a slide door, a harness part 20 situated on themovable side, which is guided out from the slider 6, is arranged on thebody side of a vehicle through a passage space, while a harness part 23situated on the fixed side, which is guided out from the casing body 2,is connected to a wiring harness or auxiliary machine of the slide doorby a connector 24. FIG. 1 shows a fully closed state of the slide doorsituated on the left side of the vehicle, FIG. 2 shows an intermediatestate during sliding, and FIG. 3 shows a fully opened state of the slidedoor.

When the electric power supply device 1 is applied to a slide sheet, forexample, when the electric power supply device 1 is placedlongitudinally on a floor panel of a vehicle body, a harness part 20situated on the movable side, which is guided out from the slider 6, isconnected to a wiring harness or auxiliary machine situated on the sideof the slide sheet, while a harness part 23 situated on the fixed side,which is guided out from the casing body 2, is connected to a wiringharness or auxiliary machine situated on the side of a power source ofthe vehicle body. FIG. 1 shows a state of a front end (or rear end)position of the slide sheet, FIG. 2 shows an intermediate state of theslide sheet during sliding, and FIG. 3 shows a state of a rear end (orfront end) position of the slide sheet.

When the electric power supply device 1 is placed laterally on a vehiclebody, a harness part 20, which is guided out from the slider 6, is bentin the thickness direction (upward direction) of the casing andconnected to the slide seat. These forms on use are the same in eachpreferred embodiment explained later on.

In the first preferred embodiment described above, the long hole or longgroove as the guiding part 17 for the slider 6 may be provided on thebase wall 9 and the cover instead of the upper wall 10 of the casingbody 2, and the slider 6 may be provided with a projection or rib whichengages with the guiding part of the slider 6, so that a harness part 20is guided out to the outside from an opening formed on the side of thecover or the base wall 9, or an opening (hole) formed on the upper wall10 of the casing body. Such a form is the same in each preferredembodiment explained later on. Further, a guiding block having anarc-shaped guiding groove may be used instead of the pair of the guidingplates 34 and 35 of the harness supporting member 4.

FIGS. 4-6 illustrate the second preferred embodiment of an electricpower supply device for a slide structure according to the presentinvention.

In an electric power supply device 31 for a slide structure according tothe second preferred embodiment, a pulley 37 is disposed along a bentpart (i.e. folded part) 3 b of a wiring harness 3 and a plurality ofsmall rollers 38 are rotatably provided facing to the pulley 37, inorder to reduce sliding resistance between the guiding plates 34, 35(see FIG. 1) of the harness supporting member 4 and the wiring harness 3in the first preferred embodiment described above.

The electric power supply device 31 for a slide structure includes: along casing having a casing body 2 and a cover (not shown in thefigure); a wiring harness 3 having a round or elliptic shape in itscross section to be received in the casing being bent in a U or J-shape;a slider 6 which holds an end (movable end) of the wiring harness 3 andis set slidable in the longitudinal direction of the casing along thecasing; and a pulley 37 and a plurality of small rollers 38 slidablyplaced on an inner and outer surface of a bent part 3 b of a wiringharness 3, respectively, wherein a supporting plate body 7 supports thewiring harness 3 with surface contact or line contact, so that a harnesssupporting member 36 slides along the casing.

As shown in FIG. 4, the harness supporting member 36 includes: ahorizontal supporting plate body 7 having a rectangular shape or a bandplate-shape; a connecting plate 33 continuing to the supporting platebody 7 vertically at a rear end of the supporting plate body 7; aplurality of small rollers 38 rotatably supported and placed forming inan arc-shape on a rear end of the connecting plate 33; and a pulley(i.e. large roller) 37 rotatably supported facing to the small rollers38 in the middle of the connecting plate 33. The pulley 37 and smallrollers 38 are supported by the connecting plates 33 with a centershafts 37 a and 38 a, respectively. Each peripheral surface of thepulley 37 and small rollers 38 has a width approximately equal to anouter diameter of the wiring harness 3.

The bent part 3 b of the wiring harness 3 is slidably engaged being putbetween the pulley 37 and a plurality of the small rollers 38, and anupper side part 3 a of the wiring harness 3 extends to a slider 6 alongan upper surface of a supporting plate body 7 while a lower side part 3c of the wiring harness 3 extends to an opening 22 of a step 8 along alower wall 12 of the casing body 2.

At a forward end position of the slider 6 as shown in FIG. 4, the pulley37 is located in the proximity of the step 8 within a wide part 2 b ofthe casing body 2, at an intermediate position of the slider 6 duringsliding as shown in FIG. 5, the pulley 37 is positioned approximately ata middle in the longitudinal direction of the wide part 2 b of thecasing body 2 so that the supporting plate member 7 supportsapproximately the whole length of the upper side part 3 a of the wiringharness 3, and at a backward end position of the slider 6 as shown inFIG. 6, each small roller 38 approaches an rear end wall 14 of thecasing body 2 while the pulley 37 rotatably supports the bent part 3 bof the wiring harness 3 in front of the small rollers 38.

When the slider 6 slides from the state shown in FIG. 4 to the stateshown in FIG. 5 or from the state shown in FIG. 5 to the state shown inFIG. 6, the wiring harness 3 is moved integrally with the slider 6. Whenthe wiring harness 3 is moved, the pulley 37 and each small roller 38rotate in the same direction so as to reduce the sliding resistancebetween the pulley 37 and each small roller 38 and an inner and outersurfaces of the bent part 3 b of the wiring harness 3. The supportingplate body 7 is moved in the same direction integrally with the pulley37 and small rollers 38, with stably supporting the wiring harness 3.

The reference numeral 18 denotes a slit hole as the guiding part for theslider 6 and the reference numeral 17 denotes a long hole or long grooveas the guiding part for engaging a side end of the supporting plate body7.

In the second preferred embodiment described above, a plurality of smallrollers may be placed forming an arc-shape instead of using the pulley37. Further, a pulley 37 may be placed at an inner side of the bent part3 b of the wiring harness 3 while a guiding plate 35 having an arc-shape(see FIG. 1) in the first preferred embodiment may be placed at an outerside of the bent part 3 b of the wiring harness 3. Alternatively, aplurality of small rollers 38 may be placed at an outer side of the bentpart 3 b of the wiring harness 3 while a guiding plate 34 having anarc-shape (see FIG. 1) in the first preferred embodiment may be placedat an inner side of the bent part 3 b of the wiring harness 3.

Further, a semicircular guiding block (not shown in the figure) formingan arc-shaped guiding groove may be used instead of the guiding plates34 and 35. Further, in the supporting structure of the pulley 37, theconnecting plates 33 may support the pulley 37 with a pair of connectingparts on both sides of the pulley 37. Further, the number of the smallrollers 38 is not limited to four. Two small rollers 38 may besymmetrically placed at an upper and lower positions beside the bentpart 3 b of the wiring harness 3 or, alternatively, one small roller 38may be placed in the middle of the bent part 3 b of the wiring harness3.

FIGS. 7-9 illustrate the third preferred embodiment of an electric powersupply device for a slide structure according to the present invention.

An electric power supply device 41 for a slide structure includes: along casing having a casing body 2 and a cover (not shown in thefigure); a wiring harness 3 having a round or elliptic shape in itscross section to be received in the casing being bent in a U or J-shape;a slider 6 which holds an end (movable end) of the wiring harness 3 andis set slidable in the longitudinal direction of the casing along thecasing; a pulley 37 and a guiding plate 35 slidably placed on an innerand outer surface of a bent part (folded part) 3 b of a wiring harness3, respectively; a harness supporting member 42 slidable along thecasing, wherein a supporting plate body 7 supports the wiring harness 3with surface contact or line contact; and an extension coil spring(extension resilient member) 44 for connecting the supporting plate body7 to the slider 6.

The bent part 3 b of a wiring harness 3 slidably contactually engageswith the pulley 37 and the guiding plate 35, so that the harnesssupporting member 42 can move forward and backward integrally with thewiring harness 3. When the slider 6 moves, the extension coil spring 44biases the harness supporting member 42 in the moving direction of theslider 6 so as to correctly move the harness supporting member 42 andthe wiring harness 3.

As shown in FIG. 7, a center shaft 37 a of the pulley 37 is rotatablysupported by a vertical connecting plate 33 and a L-shaped connectingpiece 45, the connecting plate 33 and connecting piece 45 continues torespective side ends of a rear end of the horizontal supporting platebody 7 crossing at right angles therewith, the supporting plate body 7is extended long forward in a band plate-shape so that a front end ofthe supporting plate body 7 is close to a front end wall 13 of thenarrow part 2 a of the casing body 2. An arc-shaped guiding plate 35 isprojectingly formed on an inner surface of the rear end of theconnecting plate 33. The harness supporting member 42 includes thesupporting plate body 7, connecting plate 33, connecting piece 45,pulley 37 and guiding plate 35.

Brackets 46 and 47 are formed on a front end upper surface of thesupporting plate body 7 and on a lower half 6 a of the slider 6,respectively, hook parts at respective ends of the extension coil spring44 are hooked to the brackets 46 and 47, and the extension coil spring44 approximately has its own free length (a little extended state) atthe forward end position of the slider 6 shown in FIG. 7.

In FIG. 7, the reference numeral 18 denotes a slit hole as the guidingpart for the slider 6, the reference numeral 17 denotes a long groove orlong hole as the guiding part for the supporting plate body 7, thereference numeral 22 denotes an opening situated on the harness-fixingside, and the reference numerals 8 and 11-14 denote respective walls asperipheral walls of the casing body 2.

At a forward end position of the slider 6 as shown in FIG. 7, the pulley37 is positioned on a front end of the wide part 2 b of the casing body2, the supporting plate body 7 of the harness supporting member 42 ispositioned in a range from the pulley 37 to a front end of the narrowpart 2 a of the casing body 2, the slider 6 is positioned on a fronthalf of the supporting plate body 7, the extension coil spring 44 ispositioned along an upper surface of a front half of the supportingplate body 7, and an upper side part 3 a of the wiring harness 3 isextended long within the narrow part 2 a of the casing body 2 and stablysupported by the upper surface of the supporting plate body 7 for thewhole length of the upper side part 3 a.

When the slider 6 moves backward starting from the state shown in FIG.7, as shown in FIG. 8, the extension coil spring 44 is extended so as toenlarge the distance between the slider 6 and a front end 7 a of theharness supporting member 42. The upper side part 3 a of the wiringharness 3 moves backward integrally with the slider 6. When the slider 6is positioned in the proximity of the step 8 of the casing body 2, thepulley 37 is positioned approximately at the center of the wide part 2 bof the casing body 2.

The harness supporting member 42 including the pulley 37 is resilientlybiased backward, that is, in the moving direction of the slider 6relatively to the slider 6 with restoring force due to compression ofthe extension coil spring 44, so that the pulley 37 presses the bentpart 3 b of the wiring harness 3 forward. Thereby, the upper side part 3a of the wiring harness 3 is supported between the slider 6 and thepulley 37 in its stretched condition without bending, that is, thewiring harness 3 is securely prevented from hanging down or being bent.The upper side part 3 a of the wiring harness 3 is securely supported byan upper surface of a rear half of the supporting plate body 7 withsurface contact or line contact. Thus, the slider 6 can move smoothlywithout any interference.

When the slider 6 further is moved backward from the state shown in FIG.8 and positioned at a backward end as shown in FIG. 9, the pulley 37 isclose to a rear end wall 14 of the casing body 2. The supporting platebody 7 extends from the wide part 2 b of the casing body 2 to a rearhalf of the narrow part 2 a, the extension coil spring 44 is mostextended so as to bias the pulley 37 backward and support the lower sidepart 3 c of the wiring harness 3, which runs from the pulley 37 along alower wall 12 of the casing body 2, in its straightly stretched statewithout slack. A harness part 20 to be guided out to the outside fromthe slider 6 is preferably covered with a rigid protector or the like sothat each electric wire is not affected by tensile stress during themovement.

When the slider 6 moves forward from the state shown in FIG. 9, theupper side part 3 a of the wiring harness 3 is gradually extended, thewhole length of the extension coil spring 44 is gradually shortened, thepulley 37 is resiliently biased backward so as to press the upper sidepart 3 a of the wiring harness 3 backward and gradually extend the upperside part 3 a in its stretched state. Thus, the slider 6 is smoothlymoved from its intermediate position shown in FIG. 8 to its forward endposition shown in FIG. 7.

In the third preferred embodiment described above, an arc-shaped guidingplate 34 (see FIG. 1) of the first preferred embodiment may be usedinstead of the pulley 37. A plurality of small rollers 38 (see FIG. 4)of the second preferred embodiment may be used instead of the rearguiding plate 35 shown in FIG. 7. Further, a resilient member such aselastic cord may be used instead of the extension coil spring 44.

In each preferred embodiment described above, the narrow part 2 a of thecasing body 2 may be a wide part, which continues to the wide part 2 bof the latter half with the same plane. In such a case, the opening 22for guiding out the harness is provided in the middle of the lower wallof the casing body 2 or on the front end wall. Further, if the strokecan be shortened a little, the narrow part 2 a of the casing body 2 maybe eliminated, that is, the casing body 2 may be constructed only by thewide part 2 b. In this case, the electric power supply device for aslide structure can be used as a long sliding device.

In each preferred embodiment described above, as shown in FIG. 10, thehorizontal supporting plate body 7 of the harness supporting member 4 isslidably engaged with the base wall 9 of a casing C consisting of thecasing body 2 and the cover 5 or with the guiding groove (guiding part)17 of the cover wall 15. However, instead, like an electric power supplydevice 51 for a slide structure as shown in FIG. 11, an upper or lowerend of the harness supporting member 4′ may be slidably engaged with anupper wall 10′ as a wall on the short side of the wide part 2 b of acasing C′ or with a guiding rail (guiding part) 50, 52 provided on theside of a lower wall 12. The construction of the electric power supplydevice 51 shown in FIG. 11 except the sliding structure is the same asthe construction of the electric power supply device 1, 31 or 41 in eachpreferred embodiment.

In the structure shown in FIG. 10, a gap size L between a side end 7 cof the horizontal supporting plate body 7 and a bottom surface of theguiding groove 17 must be secured to a certain extent. In the event thatthe casing C is strongly pressed (crushed) from the outside in itsthickness direction (i.e. direction of arrow T), the sliding resistancebetween the supporting plate body 7 and the guiding groove 17 isincreased, causing that the harness supporting member 4 could not slidesmoothly. However, with the sliding structure shown in FIG. 11, even ifthe casing C′ is affected by an external force being strongly pressed inits thickness direction, since the bending of the wall on the short sidesuch as the upper wall 10′ or lower wall 12 of the casing C′ due to suchan external force is very small, therefore the harness supporting member4′ can smoothly slide without being affected by an external force.

In FIG. 10, the reference numeral 33 denotes a vertical connectingplate, the reference numeral 34 denotes a guiding plate, the referencenumeral 10 denotes an upper wall, the reference numeral 12 denotes alower wall, the reference numeral 18 denotes a long hole for engagingwith the slider 6, the reference numeral 3 denotes a wiring harness 3,the reference numeral 3 a denotes an upper side part of the wiringharness, and the reference numeral 3 c denotes a lower side part of thewiring harness.

FIG. 11 shows a structure at approximately the same positioncorresponding to that shown in FIG. 10, in which a guiding rail 50having a L-shape in section is formed rising up from an upper wall 10′of the casing body 2′, the guiding rail 50 consists of a vertical base48 and a horizontal end 49, the base 48 is positioned parallel to a basewall 9′ of the casing body 2′, the end 49 is positioned parallel to theupper wall 10′ toward a base wall 9′, and a guiding groove 17′ is formedbetween the upper wall 10′ and the end 49. The base 48 is adjacent to along hole 18 (guiding part for the slider 6) of the upper wall 10′. Theend 49 is flush with the long hole 18 and an upper wall 10 adjacent tothe long hole 18, which upper wall 10 is situated in the proximity of acover 5′.

In FIG. 11, the guiding rails 50 and 52 are straightly formed along thelongitudinal direction of the wide part 2 b of the casing C′approximately for the whole length of the wide part 2 b.

In FIG. 11, the harness supporting member 4′ includes a horizontalsupporting plate body 7′ having a belt-shape and a vertical connectingplate 33′ which integrally continues to a rear end of the supportingplate body 7′ in both upward and downward directions crossing at rightangles with the supporting plate body 7′. The connecting plate 33′ ispositioned along and parallel to the base wall 9′ in a rangeapproximately from an upper end to a lower end of an inner surface ofthe base wall 9′ of the casing body 2′. The supporting plate body 7′crosses at right angles with a middle of the connecting plate 33′ in theheight direction. A horizontal slide engaging part 53 having arail-shape is integrally provided to an upper end of the connectingplate 33′ inwardly crossing at right angles therewith. The slideengaging part 53 is slidably engaged with a guiding rail 50 of thecasing body 2′.

A horizontal slide engaging part 54 is also provided at a lower end ofthe connecting plate 33′. A guiding rail (guiding part) 52 is providedat a lower end of a cover 5′. The slide engaging part 54 is integrallyformed, for example, with the rear guiding plate 35 (see FIG. 2) to haveits stiffness. A pair of guiding rails 52 is projectingly formed from aninner surface of the cover 5′. A horizontal guiding groove 55 is formedbetween the pair of the guiding rails 52.

The lower guiding rail 52 may be formed on the casing body 2′ instead ofthe cover 5′. In this case, the guiding rail 52 and the slide engagingpart 54 may be formed on the base wall 9′ instead of the cover 5′.Further, the lower guiding rail 52 and the slide engaging part 54 may beeliminated. Alternatively, eliminating the lower guiding rail 52, thelower horizontal slide engaging part 54 having a rib-shape, as thesliding part, may be set slidably contactually engaged with an innersurface of the vertical cover wall 15 of the cover 5′. The shape of theguiding rails 50, 52 and that of the slide engaging parts 53, 54 can bechanged according to need.

In any case, the guiding rails 50, 52 and the slide engaging parts 53,54 are not arranged in the middle of the casing C′ in its heightdirection (i.e. in the middle of the wall 9′ or the wall 15 situated onthe long side of the casing C′) but arranged in the proximity of thewall 10′ or the wall 12, which is situated on the short side of thecasing C′, so that the harness supporting member 4′ can smoothly slideeven if the casing C′ is pressed by external force or the like in itscrushing direction.

In FIG. 11, the reference numeral 3 denotes a wiring harness, thereference numeral 3 a denotes an upper side part of the wiring harness,the reference numeral 3 c denotes a lower side part of the wiringharness, and the reference numeral 34 denotes a front guiding plate. Thepreferred embodiment shown in FIG. 11 can also be applied to theembodiment shown in FIG. 4 or FIG. 7 besides the embodiment shown inFIG. 2.

FIG. 12 shows an electric power supply device 81 for a slide structure,in which the guiding rails 50 and 52 shown in FIG. 11 are eliminated andthe harness supporting member 4′ is provided with sliding parts 82-86having a rib-shape or plate-shape.

In the electric power supply device 81, an upper wall 10 of a casingbody 2″ is flush with an upper wall. 10 of a cover 5″. A long hole 18 issituated between both walls 10. A harness supporting member 4″ includesa vertical connecting plate 33″ which is long up and down and ahorizontal supporting plate body 7′ which crosses at right angles withthe connecting plate 33″. The connecting plate 33″ is formed a littleshorter than a distance between a lower wall 12 and an upper wall 10 ofa casing C″. An upper and lower ends of the connecting plate 33″ are thesliding parts 82 and 83 having an arc-shape in section, respectively.The sliding parts 84 and 85 having a rib-shape are projectingly formedsideward on a vertical outer side surface of the connecting plate 33″ inthe proximity of the sliding parts 82 and 83, respectively. The slidingparts 84 and 85 have a semicircular shape or an arc-shape. Each ofsliding parts 82-85 extends in a rib-shape or plate-shape in thelongitudinal direction of the casing C″.

The sliding parts 82 and 83 project in a direction crossing at rightangles with the projecting direction of the sliding parts 84 and 85.Each sliding part has an arc-shaped smooth end face, which can smoothlyslide contacting with corresponding inner surface of the wall 10, 12 oran inner surface of the base wall (base) 9 with line contact.

A sliding part 86 having a similar shape as that of the slide engagingpart 54 shown in FIG. 11 is projectingly formed horizontally at a lowerend opposite to the connecting plate 33″ of the harness supportingmember 4″. An end of the sliding part 86 is a smooth face having anarc-shape in section. The end face of the sliding part 86 is positionedin the proximity of an inner surface of the vertical cover wall (base)of the cover 5″ having a little gap therebetween and can slide smoothlycontacting with the cover wall 15 with line contact.

The sliding parts may have a projection-shape instead of a rib-shape ora plate-shape. It may be possible to form a plurality of sliding partseach having a projection-shape in a line. Alternatively, the slidingparts 82 and 83 may be formed in a plate-shape while the sliding parts84, 85 and 86 may be formed in a projection-shape.

In any case, each of the sliding parts 82-86 of the harness supportingmember 4″ is arranged in the proximity of a corner of the upper andlower ends of the casing C″. Therefore, even if external force isapplied to the base wall 9 or cover wall 15 of the casing C″ in thethickness direction (i.e. crushing direction) of the casing C″, theharness supporting member 4″ can smoothly slide without being affectedby the external force.

In FIG. 12, the reference numeral 3 denotes a wiring harness, thereference numeral 3 a denotes an upper side part of the wiring harness,the reference numeral 3 c denotes a lower side part of the wiringharness, and the reference numeral 34 denotes a guiding plate. Theembodiment shown in FIG. 12 is a section structure at approximately thesame position as that of the embodiment shown in FIG. 10. Theconstruction of the electric power supply device 81 shown in FIG. 12except the sliding structure is the same as the construction of theelectric power supply device 1, 31 or 41 in each preferred embodiment.The preferred embodiment shown in FIG. 12 can also be applied to theembodiment shown in FIG. 4 or FIG. 7 besides the embodiment shown inFIG. 2.

In each preferred embodiment described above, a corrugated tube 26 madeof synthetic resin is used as a protecting tube which covers electricwires 57 of the wiring harness 3. As shown in FIG. 13, the contactbetween the corrugated tube 26 and the supporting plate body 7 of theharness supporting member 4 is surface contact by an outer peripheralsurface of a ridge 26 a of the corrugated tube 26.

However, due to the surface contact of the protecting tube 26, thesliding resistance (i.e. friction) between the wiring harness 3 and thesupporting plate body 7 or the guiding plate 34, 35 (see FIG. 1) isincreased. For the purpose of solving this problem, as shown in FIG. 14,a net tube (i.e. braided tube) 56 made of synthetic resin is used as theprotecting tube, thereby reducing the contact area with point contact orline contact between a net part 56 a on a surface-side of the net tube56 and the supporting plate body, 7 and reducing the sliding resistance,so that the wiring harness 3 can smoothly slide contacting with theharness supporting member 4 with small friction. Due to the pointcontact or line contact of the protecting tube 56, the slider 6 cansmoothly slide, that is, the slide door can smoothly move.

The net tube 56 is a known product, in which fibers made of syntheticresin are woven or integrated in a net of fine meshes so that a top part56 a of a plurality of the net parts of fine meshes comes in contactwith a surface of the supporting plate body 7 with point contact or linecontact. The net tube 56 has excellent flexibility in comparison withthe corrugated tube 26. The net tube 56 has less stiffness than that ofthe corrugated tube 26. For example, the net tube 56 is unsuitable for apart which might have interference with the outside, however, the nettube 56 is well usable if it is used within the casing C.

In FIG. 14, only the net tube 56 is used as the protecting tube.However, for example, a net tube may be used by covering the corrugatedtube 26 therewith. In this case, the corrugated tube 26 may be providedover approximately the whole length of the wiring harness.Alternatively, the corrugated tube 26 may be provided on a portion whichis guided out to the outside from the casing C. In any case, the slidingoperation can be improved due to small friction sliding of the net tube56. The structure of the protecting tube as described above can beapplied in each embodiment shown in FIG. 4, FIG. 7 or FIG. 11 besidesthe embodiment shown in FIG. 1.

1. An electric power supply device for a slide structure comprising: acasing which receives a wiring harness folded in a U-shape; a sliderwhich holds a movable end of the wiring harness and slidably engageswith the casing; and a harness supporting member which slidablycontactually engages with a folded part of the wiring harness andincludes a supporting plate body for supporting an inner side face ofthe wiring harness.
 2. The device according to claim 1, wherein thesupporting plate body slidably engages with the casing.
 3. The deviceaccording to claim 1 further comprising a guiding part located in theproximity of a wall of a short side of the casing, wherein the guidingpart slidably engages with a slide engaging part of the harnesssupporting member.
 4. The device according to claim 1, wherein theharness supporting member includes a sliding part in the proximity of awall of a short side of the casing, wherein the sliding part slidablycontacts with an inner wall face of the casing.
 5. The device accordingto claim 1, wherein a part that slidably contactually engages with thefolded part of the wiring harness consists of a pair of guiding plates.6. The device according to claim 1, wherein a part that slidablycontactually engages with the folded part of the wiring harness consistsof a pulley and at least one small roller facing with the pulley.
 7. Thedevice according to claim 1, wherein a part that slidably contactuallyengages with the folded part of the wiring harness consists of a pulleyand a guiding plate facing with the pulley.
 8. The device according toclaim 1, wherein an extension resilient member is arranged between thesupporting plate body and the slider.
 9. The device according to claim1, wherein an outer periphery of the wiring harness is covered with anet tube that comes in point contact or line contact with the supportingplate body.
 10. The device according to claim 1, wherein the casingincludes a narrow part and a wide part, a part that slidablycontactually engages with the folded part of the wiring harness islocated in the wide part, and the supporting plate body can enter intothe narrow part.